Re: Doubt about formula transcriptionThis is a discussion on Re: Doubt about formula transcription within the pl1 forums in Programming Languages category; "James Giles" <jamesgiles @ worldnet.att.net> wrote in message news:RYOKj.156005$cQ1.70133 @ bgtnsc04-news.ops.worldnet.att.net... "glen herrmannsfeldt" <gah @ ugcs.caltech.edu> wrote in message [elided] > OK. So your advice is that we *do* have to worry about > things that were resolved in the 1960's. Note that commutativity > and associativity have always been *mathematically* correct, > so Fortran compilers have always been allowed to use them > for optimization. And I know I saw people doing it in the late > 1960's. It's certainly documented before 1970 - the XPL compiler being one where those optimisations were carried out. The IBM FORTRAN H ... | ||||||||
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#1
06-28-2008, 12:01 AM
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 Re: Doubt about formula transcription "James Giles" <jamesgiles@worldnet.att.net> wrote in message news:RYOKj.156005$cQ1.70133@bgtnsc04-news.ops.worldnet.att.net... "glen herrmannsfeldt" <gah@ugcs.caltech.edu> wrote in message [elided] > OK. So your advice is that we *do* have to worry about > things that were resolved in the 1960's. Note that commutativity > and associativity have always been *mathematically* correct, > so Fortran compilers have always been allowed to use them > for optimization. And I know I saw people doing it in the late > 1960's. It's certainly documented before 1970 - the XPL compiler being one where those optimisations were carried out. The IBM FORTRAN H compiler for the System 360 (1966) was noted for the high degree of optimisation, though whether it commuted operands I don't know, but I would be surprised if it didn't. Another of the period, the IBM PL/I Optimising compiler (c. 1969), produced good code, but (as in the case of the H compiler), I can't say whether those specific optimisations were carried out. Likewise, I would be surprised if it didn't. IBM's PL/I-F compiler (1966) also did limited optimisations.  |
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#2
06-28-2008, 04:04 AM
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| Re: Doubt about formula transcription robin wrote: > "James Giles" <jamesgiles@worldnet.att.net> wrote in message > news:RYOKj.156005$cQ1.70133@bgtnsc04-news.ops.worldnet.att.net... > "glen herrmannsfeldt" <gah@ugcs.caltech.edu> wrote in message > [elided] If you are going to snip all that I wrote, you might as well snip me out, too. -- glen |
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#3
06-30-2008, 02:31 AM
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| Re: Doubt about formula transcription On Sat, 28 Jun 2008 00:04:40 -0800, glen herrmannsfeldt wrote: > robin wrote: > >> "James Giles" <jamesgiles@worldnet.att.net> wrote in message >> news:RYOKj.156005$cQ1.70133@bgtnsc04-news.ops.worldnet.att.net... > >> "glen herrmannsfeldt" <gah@ugcs.caltech.edu> wrote in message >> [elided] > > If you are going to snip all that I wrote, you might as > well snip me out, too. > > -- glen Who said that? -- Tim C. |
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